期刊
WATER RESEARCH
卷 207, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2021.117804
关键词
Chlorine decay; Iron deposits; Kinetics model; Trihalomethane formation
资金
- National Natural Science Foundation of China [22006041]
- Guangzhou Basic and Applied Basic Research Foundation [202002030169]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515111128]
- German Academic Exchange Service (Deutscher Akademischer Austauschdienst, DAAD) [PRO-BRAL57273574]
- CAPES - Brazilian Federal Agency for Support and Evaluation of Graduate Education within the Ministry of Education of Brazil [99999.008128/2015-04]
- CAPES PDSE (Doctoral Sandwich Program Abroad) scholarship program at the FederalUniversity of Mato Grosso do Sul [PDSE 7548/11-7]
Iron deposits affect chlorine consumption and THM formation in drinking water through various mechanisms, such as accelerating reactions of DOM with chlorine through catalysis and increasing chlorine demand through adsorption. The type of deposits and properties of DOM can influence the extent of these effects.
Iron deposits stimulate chlorine consumption and trihalomethane (THM) formation in drinking water distribution systems through distinct mechanisms. In this study, a second-order chlorine decay model with a variable reaction-rate coefficient was developed to quantitatively evaluate the influences of iron deposits on chlorine reactions by considering the characteristics of dissolved organic matter (DOM), the type and dosages of deposits, as well as the initial chlorine concentrations. Based on a reliable prediction of residual chlorine, the concept that THM formation had a linear relationship with chlorine consumption was further validated by chlorination of DOM in the presence of iron deposits. Due to the catalysis influences, the reactivity of DOM towards chlorine decay or THM formation was accelerated. Although iron deposits activated the reactivity of DOM with bromine and chlorine, THM slightly shifted toward chlorinated species. Due to the adsorption influences, the maximum chlorine demand increased with the increasing deposit dosages whereas the extent of enhancement mainly relied on the DOM properties. Low-molecular-weight DOM with a hydrophilic characteristic was prone to be elevated by iron deposits. Based on the model simulation, approximately 20% of chlorine consumption and 37% of THM formation were contributed by deposits after 168 h reaction. The data provided herein emphasize the role of iron deposits in chlorine consumption and THM formation, which assist the water quality management in drinking water distribution systems.
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